Patent GB-494151-A (GB)
Title: Improvements in or relating to machines for forming a tongue at the heelward end of a sole
IPC: A43D8/34
Filed: 1937-04-15
Abstract: 494,151. Machines for shaping heel-seats. BRITISH UNITED SHOE MACHINERY CO., Ltd., ELLIOTT, H. E., CHOICE, F. C., and PRATT, J. W. April 15, 1937, Nos. 10679, 18144, and 26758. [Class 17 (i)] Relates to heel-seat shaping machines of the kind described in Specification 380,481, wherein a bulger forces part of the heel end of a sole through an opening in a matrix plate, a trimming knife moving across the surface of the plate to trim the rear margin of the sole to leave a tongue tapering to its edges, and consists in constructions providing a readily replaceable matrix plate, a bulger having a central work-engaging ridge presenting a narrow flat surface extending lengthwise of the sole, and clamping means urged towards each other to accommodate bulgers of differing size. The matrix plate 1 rests on horizontal ledges, one at each side, and is clamped thereon by bolts 25, for which slots are provided in the plate in line with slots in the ledges, and by bolts 19, which engage shoulders at the end of a wider part of the plate, and determine its longitudinal position when it is slid into place. Each pair of bolts screw into studs in bores in a lever 39 screw threaded to engage a bolt 45 abutting against the lower face of a casting 11. Each lever is formed with a lug 51 and each bolt 45 with a lateral handle 47 the arrangement being that simultaneous rearward movement of the two handles first loosens the bolts 25, 19 and then swings the levers 39 to carry the bolts 25 out of the slots in the plate, which is thus freed and can be exchanged for another. Reverse movement of the handle then clamps the new plate in position. The bulger is carried by a slide 55 in a sleeve 57 and is actuated by a treadle through a lever 157, all as described in the prior Specification. The bulger is screwed to a member 77 having dovetail sliding engagement with the slide 55 and retained thereon by a latch 79. The part 89 engaging the sole has depending flanges 93 to give clearance for an adjustable slide 97 having a gauge 107 for positioning the sole by engagement with the root of the breast flap. The member 89 has a ridge 109 more or less elevated from the side portions and merging into an elevated part 111 for engagement with the rear of the sole. On depression of the latch the bulger can be changed. The edge of the sole is clamped against the matrix plate by members 207 formed with teeth 209 at their inner upper edges and carried by arms 203 urged toward each other by a spring and pivoted to arms 71 carried by the head of the slide 57. When the heel end margin is to be completely severed, a bulger having a cross-bar 267 is provided. For use with either bulger, a two part clamp having a removable end portion 2207 may be employed, the end portion being removed when the bulger with cross-bar is employed. For preventing the knife digging into the work, a roll 147 engages the sole close to the advancing edge of the knife 9. The roll is recessed to allow for the ridge 109, is urged downwardly by a spring to a limit determined by a pin 151, and is mounted on a slide spring pressed downwardly in a casing 121 pivoted at 119 and provided with a latch 133 for maintaining it in operative position. If a partially made cut is to be repeated, the roll may be lifted forwardly out of action after releasing the latch, a spring 197 maintaining the casing in either position. Specification 331,934, [Class 17 (i)], also is referred to in the second Provisional Specification.